I don't have access to my parts book (visiting 'downtown' for some high speed internet, vs the snail dialup out at the farm), but at one time I found a touch control service manual reproduction posted on the web, possibly from a link on YT - though I can't seem to locate it at present.
The TC-39 parts book has a pretty good parts breakdown diagram, which if you are doing much if any work on your SA, would be well worth the investment.
I did rebuild the touch control block on my SA, but I don't recall not being able to access the relief valve parts. If I recall it correctly (and I admit I could be wrong), the ball and spring install from the head side, with pump pressure internally ported to the ball side of the assembly. All you should have to do is make sure the port is not obstructed (blow it out with air), the valve (ball) seat is clean and shiny, and the ball has no pits. If in doubt of the spring's condition, replace it.
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Today's Featured Article - The Cletrac General GG and the BF Avery A - A Bit of History - by Mike Ballash. This article is a summary of what I have gathered up from various sources on the Gletrac General GG and the B. F. Avery model A tractors. I am quite sure that most of it is accurate. The General GG was made by the Cleveland Tractor Company (Cletrac) of Cleveland, Ohio. Originally the company was called the Cleveland Motor Plow Company which began in 1912, then the Cleveland Tractor Company (1917) and finally Cletrac.
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